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Effect of Extended Conjugation of N‑Heterocyclic Carbene-Based Sensitizers on the Performance of Dye-Sensitized Solar Cells
Abstract
We report the synthesis, characterization, and photovoltaic properties of four ruthenium complexes (<b>CI101</b>, <b>CBTR</b>, <b>CB111</b>, and <b>CB108</b>) having various N-heterocyclic carbene ancillary ligands, pyridine-imidazole, -benzimidazole, -dithienobenzimidazole, and -phenanthroimidazole, respectively. These complexes were designed to investigate the effect of extended conjugation ordained from ring fusion on the power conversion efficiencies of the solar cells. The device sensitized by <b>CB108</b>, the pyridine-phenanthroimidazole conjugated complex, showed an improved efficiency (9.89%) compared to those of pyridine-benzimidazole conjugated system (<b>CBTR</b>, 9.72%) and the parent unfused ring system (<b>CI101</b>, 6.24%). Surprisingly, the sulfur-incorporated pyridine-dithienobenzimidazole system (<b>CB111</b>, 9.24%) exhibited a little lower efficiency than that of <b>N719</b> (9.41%). The enhanced photovoltaic performance of <b>CB108</b> was mainly attributed to the increase in electron lifetime and diffusion length confirmed by the electrochemical impedance spectroscopy- Text
- Journal contribution
- Biochemistry
- Microbiology
- Genetics
- Pharmacology
- Biotechnology
- Cancer
- Plant Biology
- Space Science
- Chemical Sciences not elsewhere classified
- photovoltaic
- CB 111
- power conversion efficiencies
- CBTR
- electrochemical impedance spectroscopy
- complex
- CI 101
- Dye-Sensitized Solar Cells
- CB 108
- parent unfused ring system
- sulfur-incorporated pyridine-dithienobenzimidazole system
- efficiency